I do agree with you, but there is a point on this that does not suit well.
"I sent an email, I was the only one to respond to their tweet and I send a message on twitter" - PixelPun
In my case, when there was still working as it was intended I've sent a message on Instagram right in the case image (there where just 4 - 5 comments in there), then I sent 2 messages and reminders... there was no response whatsoever after 3 weeks, so i decide to move on and wait for the next jam.
The fact is we choose a case because the idea or the art engaged us or it gave us some ideas to work in a full (as possible) game but it was hard to contact the owner and after 3 weeks of work, without permission, there is also no game.
Could it be possible to change here and there the theme and characters, then that game will not be here and that's why i quited.